Synthesis and magnetic properties of the chromium-doped iron sulfide Fe_1−xCr_xS single crystalline nanoplates with a NiAs crystal structure

Abstract

Single crystalline iron sulfide nanoparticles doped with chromium Fe1-xCrxS (0 ≤x≤ 0.15) have been successfully prepared by a thermal decomposition method. The particles are self-organized into the single crystalline plates with the accurate hexagonal shape and dimensions up to 1 μ in plane and about 30-40 nm in thickness. The samples have the NiAs-type crystal structure (P63/mmc) at all Cr concentrations up to x = 0.15. Fe(57)-Mössbauer spectroscopy data reveal four nonequivalent iron sites in these nanocrystals related to the different number of cation vacancies in neighboring of the iron atoms. A 2C-type superstructure or a mixture of 2C and 3C superstructures of vacancy ordering can appear in these samples. It was established that in the Fe1-xCrxS series chromium prefers to replace iron in the cation layers containing vacancies at 0.00 < x < 0.10 and Cr atoms occupy both iron and vacant sites at x > 0.10. The specific magnetic properties, which can be tuned by chromium doping, enable potential applications of these nanoparticles in technical devices using the material with thermally activated magnetic memory, for example, switches or storages.

Valleriite, a Natural Two-Dimensional Composite: X-ray Absorption, Photoelectron, and Mössbauer Spectroscopy, and Magnetic Characterization

“…Magnetic effects in valleriites can be modified via a number of factors, for example, compositions of sulfide (Fe, Cu)­S 2 and hydroxide (Mg, Al, Fe)­(OH) 2+ x layers and their electrical charges, a number of the atomic layers, external electric and magnetic fields, and so on. Moreover, the composition of valleriite-like materials can be changed in a very wide range as there exist minerals in which magnesium is replaced by iron in hydroxide layers (“ferrovalleriite”), , or iron is substituted by chromium in sulfide sheets, , or mackinawite-type iron sulfide layers with no copper in tochilinite or ferrotochilinite. ,,− In addition to the magnetic properties, superconductivity has been reported in such iron chalcogenide layers . Consequently, valleriite emerges as a platform for numerous two-dimensional composite materials, exhibiting very special and tunable properties for various applications.…”

Novel Thermal Decomposition Method for the Synthesis of Iron‐doped SnS2 Nanoparticles and Studies on their Peroxidase‐like Activity

“…have reported the preparation of Mn 2+ doped ZnS nanorods using green phosphine‐free colloidal chemistry and observed tunable blue and orange emission [14] . The synthesis of Cr doped FeS nanoparticles using thermal decomposition method and investigation of their magnetic properties have been reported by Starchikov et al [15] …”

“…[13] Deng et al have reported the preparation of Mn 2 + doped ZnS nanorods using green phosphine-free colloidal chemistry and observed tunable blue and orange emission. [14] The synthesis of Cr doped FeS nanoparticles using thermal decomposition method and investigation of their magnetic properties have been reported by Starchikov et al [15] Nanomaterials which possess enzyme-like activity are known as nanozymes (artificial enzymes) and they can be useful in biosensing, nanomedicine, environmental treatment and antibacterial activity. [16] Nanozymes can be easily synthesized, cheaper, stable, and durable as compared to natural enzymes.…”

Photoelectrochemical applications of electrochemical deposition of Ni2+-doped FeS2 thin films

“…Jiao et al [23] have deposited the Co-doped FeS2 thin films for water photolysis utilizing sunlight by Solvothermal method with enhanced photo response. Starchikov et al [24] reported the Cr doped Fe1-xCrxS single crystalline nanoplates for energy storage devices by a facile thermal decomposition technique. The fabricated Cr doped Fe1-xCrxS composite showed the enhanced magnetic properties.…”